Cam or tune problem ?
Thread Starter
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
Cam or tune problem ?
Hey guys need some help bad 
Finish TVS2300 , SD tune 383 cu in LS6.
Car runs reasonable well except for just off idle ,rev`s up easy but soon as you let up on the clutch it dies, dip the clutch quick and it recovers .
If I give it more revs you can just about drive through it but in stop and go traffic its kinda crap .
Tuner tells me its as good as he can get it , idle is now 1000rpm
1300 when coming to a stop then drops back to a 1000 6 seconds later
This has been done to try and help .
Tuner tells me the cam and injectors are to big , and the cam has low vacuum (which is 15 in hg solid at idle). Injectors are 1000cc mags.
So would you expect my cam to be causing most of my problems , I have been told by the cam supplier he has sold lots of this profile and has never had a customer come back to him with any probs.
Really don't want to change the cam if its just a good tune that I need.
Cam spec is 231/248 .617" /.595" 120+5
No codes , good solid fuel pressure .
Tell me its a tune thing
and thanks for any input .
Finish TVS2300 , SD tune 383 cu in LS6.
Car runs reasonable well except for just off idle ,rev`s up easy but soon as you let up on the clutch it dies, dip the clutch quick and it recovers .
If I give it more revs you can just about drive through it but in stop and go traffic its kinda crap .
Tuner tells me its as good as he can get it , idle is now 1000rpm
1300 when coming to a stop then drops back to a 1000 6 seconds later
This has been done to try and help .
Tuner tells me the cam and injectors are to big , and the cam has low vacuum (which is 15 in hg solid at idle). Injectors are 1000cc mags.
So would you expect my cam to be causing most of my problems , I have been told by the cam supplier he has sold lots of this profile and has never had a customer come back to him with any probs.
Really don't want to change the cam if its just a good tune that I need.
Cam spec is 231/248 .617" /.595" 120+5
No codes , good solid fuel pressure .
Tell me its a tune thing
and thanks for any input .
Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
Could be a number of things, but sounds tune related with that cam. That cam shouldn't have to idle at 1000+rpm. I wouldn't have chosen that cam, with that blower, but I'm not sure it's the cam.
Racer
Joined: Apr 2007
Posts: 262
Likes: 3
From: Austin TX
Do you own the tuning software to make changes yourself? If so, start with the idle tuning guide over on the HP Tuners forum. I think it is in a PDF on that site. It is pretty thorough, the big one being your base running airflow table. Once you've got that where you want it, look into the throttle cracker/follower info, which may fix a lot of your problems. Lots of info on getting those tables working for you is available, also. It's a long process.
Supporting Vendor
Joined: Apr 2012
Posts: 2,671
Likes: 369
From: Forney TX
Either a vacuum/boost leak or the tune is missing some tricks. Something I can usually fix remotely if you want. Sent you a PM.
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Offering products from A&A Superchargers, East Coast Superchargers, Mechman Alternators, Mantic clutches, RPS clutches, Kooks Headers, Lakewood, LG, Brian Tooley Racing, Comp Cams, FAST, ARP, UPP Turbo systems, Wiseco, Callies, K1, MAST Motorsports, Haltech and many more. PM me for details.
Thread Starter
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
Hey thanks guys .
Sounds like I can leave that sucker in there at the moment .
Will check for vacuum leaks .
I do have efi live but that is screwed up at the moment , up dates are a pita , and does not respond when trying to connect to the flash scan.
Will be looking into getting HP tuners , also have another tuner recommended so hope he can nail it down .
Bret , thanks bud , remote tuning sounds scary but brilliant
Will let you know .
Many thanks guys.
Sounds like I can leave that sucker in there at the moment .
Will check for vacuum leaks .
I do have efi live but that is screwed up at the moment , up dates are a pita , and does not respond when trying to connect to the flash scan.
Will be looking into getting HP tuners , also have another tuner recommended so hope he can nail it down .
Bret , thanks bud , remote tuning sounds scary but brilliant
Will let you know .
Many thanks guys.
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
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Thread Starter
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
, I hear they have guns in tx , not sure how patient Bret is when dealing with idiots Was thinking scary as in my crappy laptop and internet connectionalong with me having to have anything to do with it , techno phob ,yeah a bit lol.
Just a fwiw ,took all hoses off blower , and intake still have a solid 15 in hg .
Sprayed cold start around joins etc , no effect on idle at all , so not sure but don't think I have a vac leak , $hit but what do I know
Thanks guys .
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
Do you know, or are you Jeremy Clarkson?
You are, after all, from UK, right? And your tuner is not up to par (bar)?
Thread Starter
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
no not that much of a techno phob I`m not him , I don`t know him , that said I did buy an SRT-10 Viper
that I later found had been thrashed around the t/gear track by jc.
Supporting Vendor
Joined: Apr 2012
Posts: 2,671
Likes: 369
From: Forney TX
Well I can tell you that those injectors can be slowed enough to lean it out, so I wouldn't say the injectors are too big. 
Spraying around is a decent way to look for vacuum leaks. I prefer to pressure check whenever possible.
Spraying around is a decent way to look for vacuum leaks. I prefer to pressure check whenever possible.
Thread Starter
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
Also noticed guys on the Cadillac forum are having same kind of probs with this cam 12 -13 in hg and a lot of driveability issues . seems 850 rpm at idle is the norm, some are prepared to put up with bad stop and go problems because they like the rump rump at idle.
Or maybe they need a good tuner as well .
bud
Burning Brakes
Joined: Oct 2008
Posts: 1,184
Likes: 44
From: Orono, Ontario
I think it's the tune, you should take Brett up on his offer.
I have the same blower as you, only with a 402, running 100lb injectors.
Here is the cam I am running, with great drivability, idles at 875, and puts
Down 705 wheel, tuned by Arun.
I have the same blower as you, only with a 402, running 100lb injectors.
Here is the cam I am running, with great drivability, idles at 875, and puts
Down 705 wheel, tuned by Arun.
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
you lose a bit of boost?
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
no it ain't
from what i understand, it loses a little mid-band to open up the top end (which is where we see the most HP improvement). but wouldn't it lose a little VE when some of the intake air gives the spent gasses that extra push out the exhaust valve?
from what i understand, it loses a little mid-band to open up the top end (which is where we see the most HP improvement). but wouldn't it lose a little VE when some of the intake air gives the spent gasses that extra push out the exhaust valve?